Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.ServiceModel/System/ServiceModel/Channels/StreamUpgradeProvider.cs

@@ -0,0 +1,48 @@
+//-----------------------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//-----------------------------------------------------------------------------
+namespace System.ServiceModel.Channels
+{
+    public abstract class StreamUpgradeProvider : CommunicationObject
+    {
+        TimeSpan closeTimeout;
+        TimeSpan openTimeout;
+
+        protected StreamUpgradeProvider()
+            : this(null)
+        {
+        }
+
+        protected StreamUpgradeProvider(IDefaultCommunicationTimeouts timeouts)
+        {
+            if (timeouts != null)
+            {
+                this.closeTimeout = timeouts.CloseTimeout;
+                this.openTimeout = timeouts.OpenTimeout;
+            }
+            else
+            {
+                this.closeTimeout = ServiceDefaults.CloseTimeout;
+                this.openTimeout = ServiceDefaults.OpenTimeout;
+            }
+        }
+
+        protected override TimeSpan DefaultCloseTimeout
+        {
+            get { return this.closeTimeout; }
+        }
+
+        protected override TimeSpan DefaultOpenTimeout
+        {
+            get { return this.closeTimeout; }
+        }
+
+        public virtual T GetProperty<T>() where T : class
+        {
+            return null;
+        }
+
+        public abstract StreamUpgradeInitiator CreateUpgradeInitiator(EndpointAddress remoteAddress, Uri via);
+        public abstract StreamUpgradeAcceptor CreateUpgradeAcceptor();
+    }
+}